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How to use boot_once_grub method in autotest

Best Python code snippet using autotest_python

boottool.py

Source:boottool.py

...1303                self.log.error('Could not find index for entry with title '1304                               '"%s"', title)1305                return -11306        if bootloader == 'grub':1307            return self.boot_once_grub(entry_index)1308        elif bootloader == 'grub2':1309            return self.boot_once_grub2(entry_index)1310        elif bootloader == 'yaboot':1311            return self.boot_once_yaboot(title)1312        elif bootloader == 'elilo':1313            return self.boot_once_elilo(entry_index)1314        else:1315            self.log.error("Detected bootloader does not implement boot once")1316            return -11317    def boot_once_grub(self, entry_index):1318        '''1319        Implements the boot once feature for the grub bootloader1320        '''1321        # grubonce is a hack present in distros like OpenSUSE1322        grubonce_cmd = find_executable('grubonce')1323        if grubonce_cmd is None:1324            # XXX: check the type of default set (numeric or "saved")1325            grub_instructions = ['savedefault --default=%s --once' %1326                                 entry_index, 'quit']1327            grub_instructions_text = '\n'.join(grub_instructions)1328            grub_binary = find_executable('grub')1329            if grub_binary is None:1330                self.log.error("Could not find the 'grub' binary, aborting")1331                return -1...

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